Gyromagnetic ratio
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(Difference between revisions)
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|- | |- | ||
! species | ! species | ||
| - | ! <i>γ / 2π</i> (MHz/T) | + | ! <i>γ / 2π</i> (MHz/T) <cite>nistval</cite> |
|- | |- | ||
|free electron | |free electron | ||
| - | | | + | |2.80249536 x 10<sup>4</sup> <cite>niste</cite> |
|- | |- | ||
| <sup>1</sup>H | | <sup>1</sup>H | ||
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==References== | ==References== | ||
<biblio> | <biblio> | ||
| + | #nistval values are divided by 2*pi, those in nist tables are not | ||
#niste [http://physics.nist.gov/cgi-bin/cuu/Value?qgammae|search_for=gyromagnetic+ratio+electron gyromagnetic ratio of free electron] | #niste [http://physics.nist.gov/cgi-bin/cuu/Value?qgammae|search_for=gyromagnetic+ratio+electron gyromagnetic ratio of free electron] | ||
</biblio> | </biblio> | ||
Revision as of 21:52, 22 April 2009
Gyromagnetic Ratio is defined by:
where 
is the magnitude of electron charge, 
is the proton mass, 
is reduced Planck constant, 
is the nuclear magneton, and 
is the g-factor of the nucleon or nucleus in question.
Approximate values for some common nuclei are given in the Table below.<ref>Template:Cite book</ref>
| species | γ / 2π (MHz/T) [1] | |
|---|---|---|
| free electron | 2.80249536 x 104 [2] | |
| 1H | 42.576 | |
| 2D | 6.53593 | |
| 3He | -32.434 | |
| 7Li | 16.546 | |
| 13C | 10.705 | |
| 14N | 3.0766 | |
| 15N | -4.3156 | |
| 17O | -5.7716 | |
| 19F | 40.0593 | |
| 23Na | 11.262 | |
| 31P | 17.235 | |
| 75As | 7.2919 | |
| 129Xe | -11.777 |
For information on individual chemical elements please use NMR and EPR Periodic Table
To find NMR frequency of your favorite nucleus at a given magnetic field, see Alex Jerschow's on-line Interactive NMR Frequency Map
References
- values are divided by 2*pi, those in nist tables are not
- gyromagnetic ratio of free electron
